Talking-machine sound-box.



A. FISCHER.

TALKING MACHINE SOUND BOX.

APPLICATION FILED JAN.17,1910.

1,01 3, 146. Patented Jan. 2, 1912,

TALKING-MACHINE SOUND-BOX.

To all whom 2'2. may concern:

Be it known that I, ALEX FIscHER, a subject of the King of England, residing at 8 I M'aclise road, West Kensington, in the county of London, England, have invented certain new ,and' useful Improvements Relating to Talking-Machine Sound-Boxes;

, and I do hereby declare the following to be 'aifull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to talking machine sound boxes and refers to an arrangement by'means of which an extremely sensitive springing of the stylus bar and its associated'parts may be effected.

The improvement is applicable to any sound box which has a rocking plate, a

spindle or the like in connection with the stylus holder, and the essential principle of the invention is to so adapt a spring or springs in connection with the said rocking' plate, spindle or the like that such spring or springs keep the rocking plate, spindle or the like pressed upon its seating, without a tendency to tilt the plate or spindle upon such seating.

. the rocking plate or the like.

According to one way of carrying out myjinvention, I employ a flat spring, one end of which, is doubled back over itself, theother end being preferably screwed tn The spring toward the bent over end is slotted in two spring under itself, and in place of pass "ing a'screw through a slot in one bend of the spring and again through the spring and into the shell of the sound box or into 2: lug attached thereto, I pass a screw or the like through the bent under end of the spring not connected to the rocking plate or the like, thus attaching this end of the spring directly to the sound box or to a lug attached thereto, such attachment being fixed or movable by means of a slot in the end of the spring as may be desired; a hole may be made in the bend of the s ring coming over the end thus attached in order to Specification of Letters Patent.

Patented Jan. 2, 1%12.

Application filed January 17, 1910. Serial No. 538,498.

facilitate the fixing and adjustment of the screw. 1

The invention may be applied to sound boxes generally, but is especially suitable for application to a sound box of the type for which I obtained Letters Patent N 0. 904523. And in order that my said inven tion may be better understood, I will now proceed to describe the same with reference to the drawing accompanying this specifi cation, in which- Figure 1, is a plan view of one form of the invention; Fig. 2, is a like view of a slightly modified form of the invention; Fig. 3, is a view similar to Fig. 1, but employing two springs; and, Fig. 4-, is a view similar to Fig. 2, but also employing two springs.

Referring to the drawings :a represents the shell of the sound box.

6 are guide bearings.

c is a spindle to which is attached a stylus holder d.

e is a spring doubled back under itself, as shown, with one end attached to the spindle c beneath the bearing surface at f. The spring 6 is perforated or slotted at h. j is a screw passing through this perforation or slot into the shell a of the sound box. VYhep desired a hole a: may be made in the part of the pring coming opposite the screw 7' to facilitate the fixing and adjustment of the said screw 7'.

Referring to the form of the device shown at Fig. 2, in this case the spring 0 is doubled back over itself, as will be seen from the drawing and one end is again attached beneath the bearing surface f. At the other end the screw y passes through a perforation or slot at in the spring into the shell of the sound box. I

The form of the device shown at Fig. 3

-is similar to that shown at Fig. 1, except that two springs e and associated parts are p provided and attached at each end of the spindle c, and the small arm controlled by springs described in connection with my aforesaid former Letters Patent is dispensed with.

The form of the device shown at Fi 4:, is similar to that shown with respect to if ig. 2, but here again the two s rings 6 are provided, one at each end of the spindle c, and the aforesaid arm controlled .by springs is also dispensed with. y b The bent-under springs'shown at Figs. 1

and 3 are different in action to the bent over springs shown at Figs. 2 and 4, as when the screw j'is tightened in the first case, the other end of the spring is pulled toward the bearing surfaces, while when it is tightened in the latter case, the other end of the spring is pressed down, both forms have, however, the function of keeping the rocking plate, spindle or the like in contact with the bearing surfaces.

I prefer to attach the end of the spring or substantially parallel arms, one of which is rigidly secured to the spindle and the other adjustably secured to the casing in such manner that the spring itself may rock at its end about a fulcrum approximately in line with the axis about which the spindle rocks. In this way the spindle is accurately held on its bearings with a yielding pressure which may be given a very delicate adjustment.

The preferred construction and one which has now been very extensively used is shown in F ig. 3. This construction although it differs only slightly from the others gives far better results. In this case .the ends of the springs engaged by the screws are approximately in line with the edges of the bearings b so that when the spindle rocks a rocking motion is given to the springs about an axis substantially in line with the axis about which the spindle turns.

It will be understood that I may vary the shape of the spring provided that it is of such nature as described and shown.

Although I have described the invention as applied to a sound box of the type described in my former aforesaid Letters Patent it will be understood that I may adopt a spring orsprings ofthe kind described wherever suitable to sound boxes for the purpose of exerting a pressure upon a rocking plate or spindle and holding same in this way on bearings such as knife edges, points, domes or other supporting devices.

What I claim and desire to secure by Let-.

tors Patent of the United States of ma 1s:

1 In a sound box for talking machines Amerthe combination with a casing and its diaphragm of a stylus bar connected with the diaphragm, a spindle carried by the stylus bar and arranged transversely thereto, bearphragm of a stylus bar connected with the diaphragm, a spindle carried by the stylus bar and arranged transversely thereto, bearing surfaces on the casing on which the spindle rocks, a spring made of a metal strip bent upon itself and having one end attached to one end of the spindle and the other end connected with the casing by adjustable devices which hold it approxi mately in. line with the axis of rotation of the spindle, and means for yieldingly supporting the opposite end of the spindle.

3. In a sound box for talking machines the combinationwith a casing and its diaphragm, of a stylus bar connected with the diaphragm, a spindle carried by the stylus bar and arranged transversely thereto, bearing surfaces on the casing on which the spindle rocks, and a spring at each end of the spindle made of a metal strip bent upon itself and having one end attached to one end of the spindle and the other end connected with the casing by adjustable devices which hold it approximately in line with the axis of rotation of the spindle.

4. In a sound box for talking machines the combination with a casing and its diaphragm of a stylus bar connected with the diaphragm, a spindle carried by the stylus bar and arranged transversely thereto, bearin surfaces on the casing on which the spindle rocks, and a spring projecting from each end of the spindle and each made of a metal strip bent upon itself and having one end attached to one end of the spindle and the other end arranged approximately in line with the axis of rotation of the spindle, and adjustable screws engaging the free ends of the springs and attaching them to the casing, said springs being formed with openings opposite the heads of the screws to facilitate the screw adjustment,-

substantially as described.

In testimony whereof, I affix my signature, in presence of two witnesses.

ALEX FISCHER. Witnesses:

' A. E. VIDAL,

H. E. G. RowLEY. 

